Press-die



F. D. RIFNER.

PRESS DIE.

AFPLILATH f7 ILED JAN. 29. 1920.

Patented Aug. v23, 1921.-

3 SHEET$SHEET I.

F. D. RIFNER.

INVENTOR. Earp/f fidf/ bar,

A TTORNEYS.

F. D. RIFNER.

PRESS DIE. APPLICATION FILED JAN.29,1920.

1,388,374, Patented Aug. 23, 1921.

3 SHEETS-SHEET 3.

UNITED! STATES FRANK D. 3 mm,

OF DAYTON, OHIO.-

mass-DIE.

Specification of Letters Patent.

Patented Aug. 23, 1921.

Application filed January 29, 1920. Serial No. 355,012.

To all whom it may concern:

Be it known that I, FRANK D. RIFNER, a D

citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Press-Dies, of which the following is a specification, reference being had therein to the accompanying draw- This invention re1a'tes to press dies and has for its particular ob ect to provide die mechanism of improved construction which may be operated with relatively less power, and in whichthe cooperating parts will retain their normal relation to each other a lon r time than die mechanism constructed un er the common practice.

It is common practice in dies of this character to interpose springs or cushions of rubber between the die members having move ment relative to each other tomaintain their normal relation and to relieve the shock of the punching or forming operation for which the dies are used and to restore the parts to their normal relation after each operation.

It is well known in thetrade that a great amount of power is required, where the work 1 is heavy and the dies are accordingly large,

to overcome the resistance of the resilient elements between the die members in the working stroke of the punch or forming press; also that the resilient elements when constituted of the usual compression springs or of rubber cushions become set, or'lose more or less of their resiliency with use so that the relation of the die members one to the other becomes abnormal to such extent that the die will not function properly.

The purpose of the present invention is to overcome these common defects of construction by providing positive mechanical means to perform the function of the resilient elements and which will be effective to greatly reduce the power required to operate the dies and which will not be subject to the variations caused by deterioration of the resilient elements used in ordinary construction.

Furthermore, my improved die mechanism is of simple construction, positive in operation, cheap to manufacture and practicallyindestructible. It can be applied to dies of ordinary construction and to punch presses of the usual commercial types.

is shown for illustrative purposes.

Also the mechanism when once installed on a punch press is readily adaptable to dies for different products, the mechanism thus being capable of being standardized and furn shed as part of the equipment of commerclal punch presses. The mechanism may also be applied to punch presses already in use. Thus, the advantages of the invention are available to -manufacturers for punch presses already in use or as equipment of new presses to be installed.

As far as I am aware the principle of my invention is broadly new in this art. sire, therefore, to claim the invention broadly without reference to specific details, and also to claim the invention specificall as defined and comprehended in the appen ed claims.

In the accompanying drawings, a preferred form of construction of the invention As here shown, the objects of the invention are real- 128d 1n a simple practicable manner, but it will be obvious to those skilled in the art that various modifications of construction and arran ement may be made without materially a ecting either the manner or result of operation or de arting from the principle and spirit of t e invention.

' In the accompanying drawings;

Figure 1 is a detail vertical sectional view of a portion of a punch press to which my invention has been applied;

Fig. 2 is a perspective view of the mechanism comprised in the invention detached from the press; and

Fig. 3 is a longitudinal sectional view.

The invention is here shown as applied to a punch press of a well known commercial type consisting of the base frame 1, body frame 2, bed plate 3 and ram 4. Other details of the press'construction are not reqillired to illustrate the invention and are, t erefore, not shown.

The invention is shown for illustrative purposes as used in connection with a well known type of forming die, but it will be understood that its use is not limited to any particular type of die but may be used with the full advantages of the invention with the general types of blanking, forming and drawing dies or their usual combinations.

The usual bolster 5 as here shown is secured to the bed plate 3. The male memberor forming head 6, secured in a supporting I de plate 7 is mounted on the bolster 5, a pressure plate or stripper ring 8 cooperating with the head 6 in the usual manner.

The female member or forming die 9 is carried by the ram 4 being secured thereto in the usual manner by a die holder 10. These features are all well known in common practice.

As shown in F ig.,. 1 a sub-base plate 11 is secured on the under side of the bolster 5, a suitable aperture being provided in the bed plate of the press to admit the sub-plate, and the connection being made in any suitable manner. Secured in the sub-plate, at the opposite corners thereof, ashere shown, are vertical guide shafts 12, extending downwardly from the plate 11 a considerable distance into the base of the press. Also secured to the plate 11 and extending downwardly from the opposite ends thereof are cam plates 13, the purpose and operation of which will presently be described.

Mounted upon the guide shafts 12 are upper and lower vertically reciprocating plates 14 and 15, respectively, which are joined together at their opposite ends by toggle levers 16 and 17 ,the upper lever 17 having a stud or roller 18 co6perating with a cam 19 in the plates 13. The lower plate 15 is connected to the ram of the press by two opposite suspension and adjusting rods 20 and is therefore actuated in a vertical plane the full' stroke of the press at each operation thereof. Both plates 14 and 15 have a sliding connection with the cam plate 13.

The upper extension 21 of the cam '19 is on the arc of a circle on a radius from the pivot center 22 of the toggle lever 17, the lower extension of the cam 23 being parallel to the vertical sides of the cam plate. Thus during the initial movement of the plate 15 upon the down stroke of the ram the plate 14 remains stationary, the toggles expanding to compensate for the increasing distance between the two plates 14-15 until the stud 18 passes out of the are 21 of the caminto its straight extension 23 whereupon both Q plates 1415 will move equally to the completionof the down stroke of the press. On

the uplstroke of the press the conditions are just t e reverse from those, described, 2'. e., thetwo plates will move equally until the stud 18 passes from the straight cam into the arc, whereupon the upper plate will be restored to stationary positlon and the lower plate will continue its movement to the com- .and plate 15 to the completion of flush with the upper surface of the forming portion of the cam and the plate 14, ring 8.

and rods 24 will move equally with the ram the forming stroke.

he product thus formed will be in contact at its lower edge with the ring 8, the tendency of the product being to spread out-- wardly more or less at its edge over the top of the ring. Thus upon the up stroke of the press the rin will act as a stripper for the forming hea 6 and the product will be removed therefrom upon completion of the operation.

By means of the threaded shafts 20'and adjusting nuts 26 the lower plate15 may be'readily raised or lowered on the shafts l2 and relative to the plate 14 to adjust the shackle stud 18' relative to the'cam 19 to compensate for wear or to take up lost motion of the parts; also to adjust the depth of the draw or form.

It will be observed that the improved die mechanism, as best shown in Fig. 2, is a self-contained unit, that is to say, the mechanism is so interrelated that it constitutes a unit of assembly, and is adapted to be mount- .ed on a press in its assembled form.

The operation of my improved press die is apparent.- the ring 8. The forming die 9, is then forced down until'it comes into contact with the metal blank before the ring 8 begins to move. Plate 15 is also carried down with die 9. During this downward 'ovement of the forming die 9 and plate 15, t e plate 14, ring 8 and metal blank remain. stationary, the toggles 16 and 17 expanding thus allowing the necessary increased distance between the two plates 14 and 15. Just as the forming die 9 reachesthe metal blank the stud 18 will pass out of-the are 21 of the cam into the straight extension 23 and cause both plates 1415 together with ring 8 to be cartionary head 6 will press the plate into the female member 9 thus drawing the metal blank into the desired shape as the forming die 9 moves downwardlwith the ring 8 over the stationary head 6. The forming member 9- and ring 8 are then in the further operation of the ress moved upwardly together, Fi 1, the atter stripping the formed artic e from the head 6 as the parts rise until The metal blank 25 is placed on ried down with forming die 9 when the stathe ring 8 reaches the position shown in Fig. l, the forming die 9 continues to move upwardly being permitted to do so by the breaking of the tog les until 9 reaches the position shown in fig. 1. In this position the ring 8 will have stripped the article off the head 6 and raised it to the position of ring 8 in Fig. 1. The article is then removed and another blank placed on the ring 8 and this operation may be repeated indefinitely.

From the illustrations of the drawings and l the foregoing detailed description the construction, operation and results of operation of the invention will be readily understood by those experienced in this art.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a die mechanism a fixed die member, a movable die carried by the ram of the press, a movable member cooperating with the fixed die to hold the material, a member carried by the ram, and a fixed cam and connections for causing said movable member to remain stationary durin the first partof the rams motion and to follow it, to thus first hold on and then to strip off the material from the fixed die as described.

2. In a die mechanism a fixed die member, a movable die carried by the ram of the press, a movable member cooperating with the fixed die to hold the material, a member carried by the ram, and members rigidly attached to the fixed die and carrying cams, and connections between the cams and said movablemember to cause the latter to remain stationary-during the first and last part of the rams motion and to follow it, to first hold on and then to strip off the material from the fixed die as described.

3. In a die mechanism, a fixed die member,

a movable die carried by the ram of the press, a movable member cooperating with the fixed die to hold the material, a member carried by the ram, and members rigidly at-' ,tached to the fixed die and carrying cams, and toggle levers between the cams and said movable member to cause, the latter to'remain stationary during the first and last part of the rams'motion and to follow it, to first hold on andthen to strip off the material from the fixed die as described.

4. In die mechanism, the combination, with a die member mounted in fixed relation 'on the frame of a press, and a cooperating die member carried by the ram of the press, of a movable member cooperating with the fixed die member, a fixed guide, a member suspended from the ram and operable on said guide, and connections between'the sus pended member and said cooperating member whereby the latter will be caused to operate relative to the fixed die upon each stroke of the press.

5. In die mechanism, the combination, with a die member mounted in fixed relation on the frame of a press, and a cooperating die member carried by the ram of the press, of a movable member cooperating with the fixed die member, a plurality of guides extending downwardly from the fixed die, a member suspended from the ram and having reciprocal movement on said guides, and connections between the suspended member and said cooperating member whereby the latter will be caused to operate relative to the fixed die upon each stroke of the press.

6. In die mechanism, the combination, with-a die member mounted in fixed relation on the frame of a press, and a cooperating die member carried by the ram of the press, of a movable member cooperating with the fixed die member, a plurality of guides ex-' tending downwardly from the fixed die, a

member suspended from the ram and having connections between said parts whereby-the cooperating member will be actuated upon each stroke of the press.

7. In die mechanism, the combination, with a die member mounted in fixed relation on the frame of a press, and a cooperating die member carried by the ram of the press, of a movable member cooperating with the fixed die member, a plurality of guides extending downwardly from "the fixed die, a member suspended from the ram and having reciprocal movement on said guides, a mem ber operableon said guides intermediate the suspended member and the fixed'die and having connections with the suspended mem ber and said coiiperating member whereby the latter will be actuated upon each stroke ,tending downwardly from the fixed die, a

member suspended .rom the ram and having reciprocal movement on said guides, a member operable on said guides intermediate the suspended member and the fixed die and having connections with the coiiperating member and with the suspended member, whereby the distance therebetween will be varied, and the cooperating member will be .held stationa-ryduring a part and actuated during a part of the operating movement of said ram. K I

9. In die mechanism, the combination, with a die member mounted in fixed relation on the frame of a press, and a coo crating die member carried by the ram of t 1e press, of a movable member cooperating with the 10. In die mechanism, the combination, a

with a die member mounted in fixed relation on the frame of a press, and a cooperating die member carried by the ram of the press, of a movable member cooperating with the fixed die member, a plurality of guides extending downwardly from the fixed die, a,

member suspended from the ram and having reciprocal movement on sald guides, a member operable on said guides intermediate 4 the suspended member and thefixed die and having loose connections with said cooperating member, and compensating connections with said suspended member, whereby the distance therebetween will be varied and the cooperating,member will be held at rest during the initial movement, restored to rest preceding the final movement and reciprocated vertically during the intermediate movement of said ram.

11. In die 7 mechanism, the combination, with a die member mounted in fixed relation on the frame of a press, and a cooperating die member carried by the ram of the ress,

of a movable member cooperating witi the fixed die member, a stationary plate mounted in the Vertical plane of the fixed die and having a plurality of guides secured therein and extending downwardly therefrom, a member suspended from theram and having reciprocal movement on said guides, and connections between the suspended member and said cooperating member, whereby the latter will be caused to operate relative to the fixed die upon each stroke of the press.

12. In die mechanism, the comblnation, with a die member mounted in fixed relation on the frame of a press, and a cooperating die member carried by the ram of the press,

. of a movable member cooperating with the fixed die member, a. stationary plate mounted in the vertical'plane of the fixed die and having a plate with a cam secured thereto and extending downwardly therefrom, a member suspended from the ram and having reciprocal movement relative to the cam plate, and a member interposed between the suspended member and said stationary plate having connections with said cooperating member and with said suspended member,

the mar; connections cooperating with said cam to cause variable relations between the suspended member and the intermediate member, whereby operating relation between the cooperating member and the fixed die is effected.

13. In die mechanism, the combination, with a die member mounted in fixed relation on the frame of a press, and a cooperating die member carried by the ram of the press, of a movable member cooperating with the fixed die member, a. stationary plate mounted relative to the fixed die and having opposite plates with cams and a plurality of guides secured thereto and extending downwardly therefrom, a member suspended from the ram and having reciprocal movement relative to the cam plates and saidguides, and a member interposed between the suspended member and said stationary plate having connections with said cooperating member and with said suspended member, the latter connection cooperating with said cam to cause variable relations between the suspended member and the intermediate member, whereby operating relation between the cooperating member and the fixed die is efi'ected.

14. In die mechanism, the combination,- with a die member mounted in fixed relation on the frame of a press, and a cooperatingdie member carried by the ram of the press, of a movable member cooperating with --the fixed die member, a stationary plate mounted relative to the fixed die member and having opposite plates with cams and a plurality of guides secured thereto and extending downwardly therefrom, a member suspended from the ram and having reciprocal movement relative to the cam plates and said guides, and a member interposed between the suspended member and said stationary plate, being connected to said 00- operating member by a plurality of vertically arranged loose bars, and to the suspended member by oppositely disposed toggle levers having operable connections with said cams, whereby operable relation between the cooperating member and the fixed die is efiected.

15. In die mechanism, the combination, with a die member mounted in fixed relation 11 on the frame of a press, and a cooperating die member carried by the ram of the press, of a movable member cooperating with the fixed die member, a stationary plate mounted relative to the fixed die and having a plurality of guides extending downwardly therefrom, oppositely disposed cams having variably directed. coursestherein arranged relative to said guides, a member suspended from said ram and having reciprocal move- 12' ment relative to said guides and cams, a member interposed between the suspended member and the stationary plate, being loosely connected to said cooperating member, and to the suspendedmember by oppositely arranged sets of toggle levers having operable relation with said cams, whereby operable relation between the cooperating member and the fixed die is effected.

16. In die mechanism, the combination, with a die member mounted in fixed relation on the frame of a press, and a cooperating die member carried by the ram of the press, of a movable member cooperating with the fixed die member, a plurality of guides and a cam arranged relative to the fixed die, said cam having one end of its course arranged in an arc of a circle and its opposite end straight, a member suspended from ,said ram and operable relative to said guides and cam, and a member interposed between the suspended member and the fixed die, having operable relation with the cooperating memher and being connected to the suspended member by oppositely arranged toggle levers operatively connected to said cam, whereby when said toggle connections are operated through the arc of the cam the cooperating member will be held in stationary relation and when said connections are operated through the straight cam said memger will be reciprocated relative to the fixed 17. In operating mechanism for dies, the combination, with a stationary plate, a plurality of guides and oppos tely disposed cam plates secured to and extending downwardly from said plate, and cams arranged in said plates, of a plurality of vertically reciprocating plates mounted on said guides, one above the other, and joined together by opposite sets of toggle levers, each set of levers having operab e relation with one of said cams.

18. In operating mechanism for dies, the combination, with a stationary plate, a plurality of guides and oppositely disposed cam plates secured to and extending downwardly from said plate, and cams arranged in said plates, of a plurality of vertically reciprocating plates mounted bn said guides, one above the other, and having sliding connection with the cam plates, said reciprocating plate being joined together by opposite sets of tog le levers, each set of levers having operab e relation with one of said cams.

19. In operating mechanism for dies, the combination, with a stationary plate, a plu rality of guides and oppositely disposed cam plates secured to and extending downwardly from said plate, and cams arranged in said plates, of a plurality of vertically reciproeating plates operable on said guides, one

above the other, and joined together by toggle levers having operable connections with said cams, whereby the distance between said plates will be varied upon operation of said mechanism.

20. In operatingmechanism for dies, the combination, with a stationary plate, a vertically disposed guide and a cam plate ex tending downwardly from said stationary plate, and a variable cam carried by the cam plate, of a plurality of reciprocating plates operable on the guide and joined together by toggle levers having operable relation with said cam, whereby said plates will be caused to have relative movement to each other and to move equally at different times in a single operation of said mechanism.

21. In operating mechanism for dies, the combination, with a stationary plate, a vertically disposed guide and a cam plate extending downwardly from said stationary plate, of a variable cam carried by the cam plate, said cam having an extension in the arc of a circle and a straight extension, and a plurality of reciprocating plates operable on said guide, one above the other, said plates belng connected one to the other by toggle levers having an operable connection with said cam, whereby one of said plates will be maintained at rest while the other is moving during the passing of said connection through the arc of the cam and both I 

